MSTParser.DependencyPipe.ReadLines C# (CSharp) Method

        public string[][] ReadLines(StreamReader reader)
        {
            string line = reader.ReadLine();
            string posLine = reader.ReadLine();
            string labLine = Labeled ? reader.ReadLine() : posLine;
            string depsLine = reader.ReadLine();
            reader.ReadLine(); // blank line

            if (line == null) return null;

            string[] toks = line.Split("\t".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            string[] pos = posLine.Split("\t".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            string[] labs = labLine.Split("\t".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            string[] deps = depsLine.Split("\t".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);

            var toksNew = new string[toks.Length + 1];
            var posNew = new string[pos.Length + 1];
            var labsNew = new string[labs.Length + 1];
            var depsNew = new string[deps.Length + 1];
            toksNew[0] = "<root>";
            posNew[0] = "<root-POS>";
            labsNew[0] = "<no-Type>";
            depsNew[0] = "-1";
            for (int i = 0; i < toks.Length; i++)
            {
                toksNew[i + 1] = Normalize(toks[i]);
                posNew[i + 1] = pos[i];
                labsNew[i + 1] = Labeled ? labs[i] : "<no-Type>";
                depsNew[i + 1] = deps[i];
            }
            toks = toksNew;
            pos = posNew;
            labs = labsNew;
            deps = depsNew;

            var result = new string[4][];
            result[0] = toks;
            result[1] = pos;
            result[2] = labs;
            result[3] = deps;
            return result;
        }